[6pack] stripped bolt

[Mark]

Aloha all,

I have removed all of the bolts holding body tub to the frame but one.  The
passenger side on the rear deck is recessed and went in at an angle so the
washer underneath prevents the socket from getting a good bite.  I have
completely rounded over the edges in my frustration.  I've tried vise grips
but can't get a good hold.  Any ideas on how to remove this #$&^% off?

Thanks,

Mark Bullard
'74 TR6
Kailua, HI